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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c19ddb4c7bd9986d2d9aa103acb05ef299988ab1cfe1c62ba9b9cb28cca968a4' 
  AND token = 'mK6X/lCX3cTc95kq/GqzsEAkYD3XV71bhWBkZozVx1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}